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Greentoad, I am guessing you are using the API liquid test kit?
In which case you can most likely ignore that green tint that is less than the point .25 color on the matching chart. My tests often produced that kind of color ambiguity. After posting on here I saw other threads indicate that problem.

How long has this tank been set up and what are the current inhabitants?

established tanks should read 0ammonia so much 0, that it is bright yellow.
I know the 0.25ppm has a slight green tint to it, but when you really are at 0ppm, you know for sure b/c it lemonade colored.

The tank has been set up since August 2010. You guys are clever; I am indeed using the API test kit, and i tested both tank water and tap water, and well, the two vials are identical with what seems to be the slight green tint that is so hard to pinpoint exactly.
Current tank inhabitants include 3 harly's, 5 black neons, and 1 common pleco. I'm going to add to these characin schools as soon as I get back from traveling in 2 weeks or so.

I didnt mention the pleco before because I'm desperately trying to get rid of it, and I'm close to sending it on it's way. I've got filtration for a 50 gallon tank currently, and again the weekly water changes. I appreciate anymore tank suggestions. Thanks!